I've been searching everywhere for some inclination about the performance of Photoshop on a new iMac. I am a web designer and I want to be able to pan/zoom my designs around in photoshop without any jerkyness. I don't know if a 27" non-retina iMac with a 780m (4gb) graphics card would work or if the 5k m295x would be better. I would also have another Thunderbolt display running at the same time which makes me think I'm going to need something beefy. I'm currently working off of a 2012 15" non-retina macbook pro that has 512mb gt650 video card and its super jerky on my Thunderbolt monitor. My patience has ran out with this setup and I want to get something where I can pan my design around without the system going to below 30fps. Any first hand experience or thoughts about this? Will I need to go to a Mac Pro? Thanks!